JPS594815B2 - Exposure device for color picture tube - Google Patents

Description

[Detailed description of the invention] The present invention relates to an exposure apparatus for color picture tubes.

In general, when manufacturing color picture tubes, a phosphor or photoreceptor is placed on the inner surface of the face plate in order to obtain a dot-shaped or striped arrangement of phosphor surfaces, or a similar arrangement for graphite coating for the so-called black matrix. The method used is to apply a coating agent and expose it to light through a shadow mask.

Figure 1 shows a schematic configuration of a conventional exposure apparatus, in which the exposure light beam emitted from an exposure light source 1 corresponding to the emission position of the electron beam of the color picture tube draws a trajectory similar to that of the electron beam. The phosphor or photosensitive material applied to the inner surface of the face plate is passed through a correction lens 2 and a filter 4 for correcting the light intensity distribution in the central and peripheral areas of the face plate 3, and then through a shadow mask 5 attached to the face plate 3. It's exposed.

In the figure, 6 indicates an ultra-high pressure mercury lamp as a light source, and γ indicates a condensing lens.

It has been common practice to perform exposure using devices that rely on such light source systems, but the loss of light energy within the condensing lens is large, making it difficult to utilize the total luminous flux emitted from the ultra-high-pressure mercury lamp for exposure effects. This has the drawback that the light emitted from the tip of the condenser lens is weak, resulting in a long exposure time.

In order to solve this drawback, a method has been proposed in which light emitted from an ultra-high pressure mercury lamp is used for direct exposure without using a condensing lens.

FIG. 2 shows a sectional view of an example of an exposure apparatus using such a light source system.

In the figure, reference numeral 8 denotes a device casing, which has a plate 9 on its upper portion on which the face plate 3 is positioned and mounted.

The light source section includes an ultra-high pressure mercury lamp 10 and a lamp house 11 which serves as a chamber for mounting the ultra-high pressure mercury lamp or effectively utilizing a cooling medium for removing heat generated by the ultra-high pressure mercury lamp itself.

In the exposure work, as shown in FIG. 2, the relative position of the face plate 3 and the inner tube of the quartz tube 12, which is the substantial light source of the ultra-high pressure mercury lamp that is the light source, is arranged with high precision. This is necessary to accurately form the relative positions of the blue, green, and red holes or stripes on the inner surface of the faceplate.

One method of relative positioning between the inner tube of the light source, that is, the ultra-high pressure mercury lamp, and the plate 9 on which the face plate 3 is positioned is to attach the ultra-high pressure mercury lamp 10 to the lamp head 11, and then attach the ultra-high pressure mercury lamp 10 to the lamp head 11. This can be done by turning on the lamp and operating the fine movement mechanism 13 provided at the bottom of the lamp head 11 using the plate 9 as a reference.

However, this method requires positioning work every time the mercury lamp is replaced, and during this time the exposure apparatus cannot be used for work, resulting in a significant drop in operating efficiency.

The purpose of the present invention is to solve such problems, and for this purpose, a socket part of an ultra-high pressure mercury lamp serving as a light source,
An object of the present invention is to provide an exposure device for a color picture tube, which is equipped with a light source part having sufficient mounting accuracy for the purpose of positioning the light source in a lamp-mounted mercury lamp mounting part for mounting the ultra-high pressure mercury lamp.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the apparatus of the present invention will be explained below along with embodiments shown in the drawings.

FIG. 3 is a longitudinal sectional side view of the device of the present invention.

In the figure, reference numeral 8 denotes a device housing, and the upper part thereof is a plate 9 on which the face plate 3 is positioned and mounted.

Further, 10 is an ultra-high pressure mercury lamp, and 14 is a centering jig for aligning the center position of the ultra-high pressure mercury lamp 100 with the inner tube part of the quartz tube within the accuracy required for exposure work.

The mechanism of the centering jig is, for example, a mechanism using multiple eccentric rings, a sliding mechanism in the XY directions, or
A mechanism combining these is conceivable, but the centering jig 14 and the centered ultra-high pressure mercury lamp 10 are positioned and fixed in advance with respect to the plate 9 within the accuracy necessary for exposure work. By attaching the centering jig to the mounting hole of the centering jig, the relative position between the face plate 3 and the inner tube of the ultra-high pressure mercury lamp 100 quartz tube, which is the actual light source, can be adjusted in a very short time and easily. It is possible to complete the placement with precision.

As is clear from the above description, according to the present invention, by preparing an ultra-high-pressure mercury lamp whose centering has been completed in advance, production can be reduced by simply stopping the operation of the equipment and the time required for replacement work. At the same time, high accuracy can be stably maintained, and a high-quality color picture tube can be obtained.

[Brief explanation of drawings]

1 and 2 are schematic configuration diagrams and sectional views of essential parts of a conventional exposure apparatus, and FIG. 3 is a sectional view of essential parts of an exposure apparatus according to the present invention. 1... Exposure light source, 2... Correction lens,
3...Face plate, 4...Filter, 5...Shadow mask, 6...
Ultra-high pressure mercury lamp, 7...Condensing lens, 8...
...Casing, 9...Plate, 10...
Ultra-high pressure mercury lamp, 11...Lamp-us, 12
...Quartz tube, 13...Fine movement mechanism.

Claims (1)

[Claims] 1. An exposure device for a color picture tube that exposes a phosphor or photosensitizer coated on the inner surface of a face plate using a mercury lamp housed in a lamp house provided in the device housing, which is equipped with an easily attachable and detachable centering jig; The jig has an adjustment mechanism that can align the center of the quartz tube, which is the light emitting part of the mercury lamp, with the center of the jig, and a lamp house with a mounting hole to which the centering jig is attached is installed inside the device housing. Position and fix the lamp in this position.
1. An exposure apparatus for a color picture tube, characterized in that a centering jig, on which the mercury lamp is mounted, is directly mounted in a mounting hole of a screen.